Update GitHub Actions workflows. (#314) #113

Job	Run time
prerequisites	1m 32s
lint / lint	41s
generate_coverage_data	1m 27s
build_sdk (nodejs)	2m 8s
build_sdk (python)	1m 45s
build_sdk (dotnet)	1m 31s
build_sdk (go)	2m 13s
build_sdk (java)	1m 36s
test (nodejs)	2m 50s
test (python)	2m 37s
test (dotnet)	2m 35s
test (go)	2m 24s
test (java)	2m 14s
publish	8m 40s
publish_sdk	3m 7s
Tag release if labeled as needs-release	5s
	37m 25s

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